Portable mortis cutting tool



p 9, 1952 A. J. KRONQUIST 2,609,849

PORTABLE MORTIS CUTTING TOOL Original Filed April 2, 1947 I N VEN TOR. ALFRED J KRONQUIST Patented Sept. 9, 1952 UNITED STATES PATENT OFFICE PORTABLE tiriis' rii zorrma root Substituted for application Serial No. 738,961, April 2; 1947. p This application May 21, 1951,

Serial No. 227,560

4 Claims. 1

This: application is a substitute for? application Serial No. 738,961 filed .April 2, 1947.

This invention pertains to a motor driven manually portable mortis cutter, of the type wherein Ca handle-carrying .casin contains a motorand' also a driving connection for'acutter, which cutter is also mounted directly .upon said casing.

object of theinventionisxto provide for mounting a rotatable cutter blade inamoread vantageous position upon the portable casing which carries it, so that safety .will be provided for by exposingonly a relatively :small part of the cuttersedge, and. yet thecutter will be so positioned that it may readily beiapplied to the were to cut thereint'ot'o thedesired extent and in the desired directions.

Another object is to proviuean. improved mov= able housing means both for the motoran'd the cutter whereby the extent to which thecutter projects from the casing during operation may be more satisfactorily controlled.

Other objects, advantages and features of invention will hereinafter appear.

Referring to theacco'mpanying drawing, which illustrates a. preferred embodiment of the invention,

Fig. 1 is a side elevationpparts being sectioned on line |-l of'Fig. 2. I

Fig. 2 is asection on line-2-2 of Fig. 1.

3 is an elevation looking at the righthand end of Fig. 2. l

Fig. 4 is a'section on-1ine44 of Fig. 2.

Fig. 5' is a section online' 5- 5of Fig. l.

6 is an electrical wiring diagram, including a diagrammatical showing of the manually operable switch for startingand stopping the motor.

Referring indet'ail to the drawing, the casing 1 is of a generally quadrilateral shape except "thatit has a cut-away corner'portion 8 The handle 9 is carried by a cover plate, and by its use the operator may bodily vary the position of the entire tool in the application of the cutter I I thereof tothe work.

Said cover I is attached to the casing by fastening means 12 in an overlying-relation to an interior space consisting of a motor chamber 14 and a cutter mechanism chamber l5, which chambers are partially sep'aratedb'y inward extensions 1'6 and Hot the casing wall, said chamber 15 occupying a corner portion of the casing.

A large cavitated. bearing block T8 is held in place Within the cutter chamber 15 by means of saidwall portions I 6 and I 1 and the corner'portions of the casing walls 20 and 2|, saidblock being thus supported to slide vertically (as viewed in Fig. 1) while held against horizontal movement.

As viewed in Figs. 1 and 2 the casing has a 1 means of cap screws 26.

motor.

cutter blade I I.

'2 thickened end wall portion 22 provided with a large circular aperture 23 which apertureiscontinned through a cap ring 24, said ring in turn having screwed into it a plug 25 which closes the aperture thereof, the ring 24 being attachedby Said passage 23 is spherically 'outcurved or bulged in such a manner as to provide a suitable bearing surface for a bearing head 21 carried by a projecting end portion ofthe shaft 29 of the motor 39;, said headil being shaped as a spherical body truncated at each end. To reduce the rotational friction of the motor shaft a ball bearing structure 31 is provided so that a bearing means is provided for both rotational and lateral movement of the motor shaft.

Continuing with the description of the parts within the slide bearing block [8, that end portion of said block which is nearest to themotor contains a bearing cavity 32 shaped as a truncated sphere so as to have movably fittedwithin it a bearing head 33 shaped like the already described bearing head 21. This arrangement is providedin order topermit the bearing block l8 toube moved as indicated by dotted lines in Fig. 1 without interfering with the operation of the The motor shaft 29 is extended beyond the bearing block 3-3; thus the extended part 35 carries a guide means 36 for a bevel piniongear 31 attached to the extremity of the extended motorsh'aft. Said gear 31 meshes continually with the cutter driving gear 38, the just mentioned guide means being providedto insure proper c'ontinuousmeshing of said gears.

The cutter gear 38 is secured to the cutter shaft 42, said shaft having in turn secured to it an elongated 'two-part cutter head-43, the two parts of which are securedtogether byrmeans of countersunk screws 44 which pass through the Said cutter shaft 42 is surrounded bya ball bearing structure '4 5. iitted into a recess provided for it in one side of the large bearing block l8, said shaft 42 extending through said bearing block and projecting therebeyond,

its projecting portion having attached to it a nut 46, adjacent to said nut the block I 8 contains a ball bearing 41 which surrounds saidshaft.

The adjustment of the large bearing block I8 is efiected by means of a screw threaded stem: :49 carrying a head 50 externally of thecasin'g. The

3 In the operation of the tool the workman will grasp the handle 9, and block l8 being adjusted to the position shown in Figs. 1 and 2, and after raising the trigger 55 to turn on the current to turn on the motor and rotate the cutter, will so position the casing as to bring the projecting edge portion of the cutter into engagement with the work.

An adjustable guide member 51 is secured. to the casing to travel along the track member 58 and 59, said guide being held in the desired position by set screw 6t.

The cut-away portion 8 is constructed with a straight-edge runner E2 to provide a guide means when it is being used for mortising for door and window hinges, and the graduations it? can be usedto measure the cut-out l ngth in the work, as measured from the gauge mark H. I

The gear 3'! is carried by a slide-block 62 which block operates in its slide bearing 65, and as the block 62 is moved its trunnions 63'will slide in a related line (with the movement of said gear 38) in their slide grooves 65, thus holding the proper mesh clearance between the teeth of said gears 3i and 38 at any adjusted position of said cutter H. I

This portable mortising tool will be used to mortis doors and windows for conventional hinges to be inserted and secured therein in combination with their frames, thusfor my primary object of my" invention is to provide a new and useful portable door and window hinge mortiser for conventional type hinge-s tobe inserted and secured therein in combination with the frame.

I claim:

1. In a manually portable cutting tooihaving I a rotary cutter and a motor therefor; a housing for said cutter and said motor, said motor including a drive shaft projecting from one end thereof rotatable about a generally horizontally extending axis coincident with that of the motor,

va horizontally extending cutter shaft on which said cutter is secured extending past one end of said drive shaft at right angles to the latter,

a bearing carried by said housing at the end of said motor opposite said drive shaft supporting said motor for vertical swinging about a horizontal axis extending through said axis of said a motor and drive shaft, a block within said housing, guides carried by said housing supporting said block for vertical movement relative to said housing, bearings for said cutter shaft and said drive shaft carried by said block for vertical motor, a horizontally extending cutter shaft on which said cutter is secured extending past one end of said drive shaft at right angles to the latter, a bearing carried by said housing at the end of said motor opposite said drive shaft supporting said motor for vertical swinging about a horizontal axis extending throughfl'said axis, of

said motor and drive shaft, ablocl: within said.

housing, guides carried by said housing supporting said block for vertical movement relative to said housing, bearingsfor said cutter shaft and said drive shaft carried by said block for vertical movement therewith, interengaging gears respectively on said cutter shaft and saiddrive shaft, an adjusting screw carried by said housing and connected with said block for raising and lowering said block upon rotation of said screw in one direction or the other, the bearing for said drive shaft being coaxial with the latter at all times during its vertical movement with said drive shaft, and said block and bearing being formed with complementary spherical slidably engaging surfaces permitting relative movement between said last mentioned bearing and said block during said vertical movement of said block. 1

3. In a manually portable cutting toolhaving a rotary cutter and a motor therefor; a housing, a partition within said housing dividing-the latter into a motor compartment in which said motor is positioned and a cutter compartment within which said cutter is. positioned, said partition including a bearing b1ock,:a cutter shaft on which'said cutter is secured, bearings carried by said block respectively supporting one end of said motor and s'aidshaft, said motor ineluding a drive shaft, interengaging gears connecting said drive shaft with said cutter shaft, a bottom wall onsaidjhousing, closing the lower side thereof, guide-members within said housing rigid therewith supporting said bearing block for movement toward and away from said bottom wall, said bottom wall being formed with an opening for said cutter, and a bearing on said housing supporting the end thereof opposite said one end for swinging ofthesaid one end of said motor toward and away from said bottom wall, an adjusting member on said housing connected with said block for moving said block. toward and away from said bottom.

4. In a manually portable cutting tool having a rotary cutter and a motor therefor having a drive shaft; a horizontally elongated housing inclosing said motor with said drive shaft .extending longitudinally thereof, a horizontal cutter shaftextending across the endof said drive shaft at right angles thereto said housing including a lateral extension projecting laterally therefrom and into which said cutter shaft projects, said cutter being within said extension and secured on said cutter shaft, interengaging gears respectively on said cutter shaft and on said drive shaft connecting them for driving said cutter shaft by said drive shaft, said cutter including blades projecting below said extension and extending longitudinally of said cutter shaft for engagement with material to be cut, an elongated guide member below said extension extending longitudinally of said housing and transversely of said blades, said guide member being movable transversely of said housing, means supporting said member for such movement and means for securing said'member in adjusted position at any point insaid movement,

'a bottom wall on said housing projecting there'- from alongside said extension, said guide member extending below the said extension of said No references cited. 

